Question

Find X.

16.7 + 12.38 – X = 10.09 [IMO-2015]

(1) 17.89 (2) 18.99 (3) 16.98 (4) 20.09​

Answer 1

Answer:

Let 16.7 + 12.38 - x =10.09

∴ x = 16.7 + 12.38 - 10.09

= 18.99

Answer 2

Given equation:

16.7+12.38-x = 10.09

To find:

The value of x.

Solution:

16.7+12.38-x = 10.09

16.7+12.38 = 10.09+x

29.08 = 10.09+x

29.08-10.09 = x

18.99 = x

Verification:

On substituting the value of x as 18.99 in the equation, we get,

16.7+12.38-x = 10.09

16.7+12.38-18.99 = 10.09

29.08-18.99 = 10.09

10.09 = 10.09

LHS = RHS

Hence Verified!

Final answer:

The value of x is 18.99.

Therefore option 2) 18.99 is correct ✔